Serotonin 5-HT2 receptor imaging in major depression: focal changes in orbito-insular cortex.
BACKGROUND
Serotonin receptors may play an important role in the pathophysiology of affective disorders. We studied type-2 serotonin (5-HT2) receptors in the brain of patients with major depression.


METHODS
Using positron emission tomography (PET) and the selective radioligand [18F]altanserin, we investigated 5-HT2 receptor distribution in eight drug-free unipolar depressed patients and 22 healthy subjects. Data were analysed using Statistical Parametric Mapping 95.


RESULTS
In depressed patients, [18F]altanserin uptake was significantly reduced in a region of the right hemisphere including the posterolateral orbitofrontal cortex and the anterior insular cortex. A trend to similar changes was found in the left hemisphere. No correlation was found between the uptake and the Hamilton rating scale score.


CONCLUSIONS
Pathophysiology of depression may involve changes in 5-HT2 receptor in brain regions selectively implicated in mood regulation.
Biver
F
F
Department of Psychiatry, Erasme Hospital, Brussels, Beligum. fbiver@ulb.ac.be
Wikler
D
D
Lotstra
F
F
Damhaut
P
P
Goldman
S
S
Mendlewicz
J
J
D001927:Brain Diseases / Q000000981:diagnostic imaging*; D003866:Depressive Disorder / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D007650:Ketanserin / Q000031:analogs & derivatives*; D008297:Male; D008875:Middle Aged; D011985:Receptors, Serotonin / Q000378:metabolism*; D012702:Serotonin Antagonists; D014055:Tomography, Emission-Computed / Q000379:methods*
D011985:Receptors, Serotonin; D012702:Serotonin Antagonists; C071983:altanserin; D007650:Ketanserin